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Add up a column of numbers at the Unix shell
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python3 -c"import os; print(sum(os.path.getsize(f) for f in open('files.txt').read().split()))"
Or if you just want to sum the numbers, pipe into:
python3 -c"import sys; print(sum(int(x) for x in sys.stdin))"
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Why use argparse rather than optparse?
I noticed that the Python 2.7 documentation includes yet another command-line parsing module. In addition to getopt and optparse we now have argparse .
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what does the __file__ variable mean/do?
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When a module is loaded from a file in Python, __file__ is set to its path. You can then use that with other functions to find the directory that the file is located in.
Taking your examples one at a time:
A = os.path.join(os.path.dirname(__file__), '..')
# A is...
How Pony (ORM) does its tricks?
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Pony ORM author is here.
Pony translates Python generator into SQL query in three steps:
Decompiling of generator bytecode and rebuilding generator AST
(abstract syntax tree)
Translation of Python AST into "abstract SQL" -- universal
list-based representation of a...
Filter dict to contain only certain keys?
...Uses dictionary comprehension.
If you use a version which lacks them (ie Python 2.6 and earlier), make it dict((your_key, old_dict[your_key]) for ...). It's the same, though uglier.
Note that this, unlike jnnnnn's version, has stable performance (depends only on number of your_keys) for old_dicts...
How to get POSTed JSON in Flask?
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For reference, here's complete code for how to send json from a Python client:
import requests
res = requests.post('http://localhost:5000/api/add_message/1234', json={"mytext":"lalala"})
if res.ok:
print res.json()
The "json=" input will automatically set the content-type, as discu...
Using .sort with PyMongo
...is that the ordering of the arguments matters and dicts are not ordered in Python < 3.6
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Multiple levels of 'collection.defaultdict' in Python
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This is awesome. It seems I renew my marital vows to Python daily.
– mVChr
Nov 3 '14 at 22:32
3
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Why do you need to create a cursor when querying a sqlite database?
I'm completely new to Python's sqlite3 module (and SQL in general for that matter), and this just completely stumps me. The abundant lack of descriptions of cursor objects (rather, their necessity) also seems odd.
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Add Variables to Tuple
I am learning Python and creating a database connection.
While trying to add to the DB, I am thinking of creating tuples out of information and then add them to the DB.
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